import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login'
import Home from '../components/Home'
import Welcome from '../components/Welcome'
import User from '../components/user/Users'
import Cate from '../components/goods/Cate'
import Params from '../components/goods/Params'

Vue.use(VueRouter)

const routes = [
  { path: '/', redirect: '/login' },
  { path: '/login', component: Login },
  {
    path: '/home',
    component: Home,
    redirect: '/welcome',
    children: [
      { path: '/welcome', component: Welcome },
      { path: '/users', component: User },
      { path: '/categories', component: Cate },
      { path: '/params', component: Params }
    ]
  }
]

const router = new VueRouter({
  routes
})

// 挂在路由导航守卫
router.beforeEach((to, from, next) => {
  // to将要访问的路径
  // from代表从哪个路径跳转而来
  // next是一个函数,表示放行
  // 如果用户访问的登录页,直接放行
  if (to.path === '/login') return next()
  // 从sessionStorage中获取保存的token值
  const tokenStr = window.sessionStorage.getItem('token')
  // 没有token,强制跳转登录页
  if (!tokenStr) return next('/login')
  next()
})

export default router
